Definition of Samnite in English:

noun

The city of Rome gradually gained power from the time of the Tarquins, subduing the Etruscans, Sabines, Samnites, and Greek settlers, and by the mid-3rd century BC, controlled Italy.

In particular, the Romans fought against the Etruscans and the Samnites.

Thus, the alternate reality mode lets you play as the more challenging Celts, Samnites, Picts and other famous Roman antagonists, but you're almost self-assured of victory, provided you have a starting chance.

adjective

He showed a particular vindictiveness against the Samnite troops which his enemies had raised in large numbers, evoking an echo of the Social War.

Correspondingly, the Roman success ensures that the alternative spectacle anticipated by Papirius will actually come to pass: the Samnite weapons are indeed displayed in triumph and decorate the temples of the Romans and their allies.